<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <ul>
      <li v-for="(number, index) in numbers" :key="index">
        <span>{{ number }}</span>
        <button @click="del(index)">删除</button>
      </li>
    </ul>
    <button @click="add">生成</button>
  </div>

  <script src="./vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        numbers: [
            1, 2, 3, 4, 5
        ]
      },
      methods: {
        add() {
          // 生成一个随机数
          const randomNumber = Math.floor(Math.random() * 20) + 1;
          this.numbers.push(randomNumber);
        },
        del(index) {
          this.numbers.splice(index, 1);
        }
      }
    });
  </script>
</body>

</html>